SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 82: Higgs, Di-Higgs II

T 82.1: Vortrag

Mittwoch, 22. März 2023, 17:30–17:45, HSZ/0105

Constraints on the Higgs boson self-coupling, κ_λ, and the di-vector boson di-Higgs boson coupling, κ_2V, via Higgs boson pair production with the ATLAS detector — Jochen Dingfelder¹, Tatjana Lenz¹, Christopher Deutsch¹, and •Fiona Ann Jolly² — ¹Physikalisches Institut, Universitat Bonn, Germany — ²Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg

After the discovery of the Higgs boson in 2012, searches for Higgs boson pair production have become valuable in probing the Higgs boson self-coupling, κ_λ. The dominant mode for Higgs boson pair production is gluon-gluon fusion (ggF) followed by vector boson fusion (VBF), which produces two additional jets in the final state. Both production modes provide access to κ_λ. In addition, the VBF mode provides access to two other couplings: the quartic HHVV coupling (κ_2V) and the Higgs boson-vector boson coupling (κ_V) with V = W, Z.

In this talk, a search for Higgs boson pair production via ggF and VBF in the bbττ final state (both τ leptons decay hadronically) using 139 fb⁻¹ of proton-proton collisions at 13 TeV recorded with the ATLAS detector, is presented. Expected constraints on κ_λ and κ_2V are obtained after employing a categorisation strategy that separates the VBF and ggF modes in the statistical analysis. In addition, extrapolated results for an integrated luminosity of 3000 fb⁻¹ are given.